Abstract
The current knowledge on the occurrence and activity of NO in plants is reviewed. The multiplicity of nitrogen monoxide species and implications for differentiated reactivity are indicated. Possible sources of NO are evaluated, and the evidence for the presence of nitric oxide synthase in plants is summarised. The regulatory role of NO in plant development and in plant interactions with microorganisms, involving an interplay with other molecules, like ethylene or reactive oxygen species is demonstrated. Finally, some other suggestions on potential functions of NO in plants are indicated.
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